Significant Figures Calculator
Type a number exactly as written to count its significant figures and round it to as many as you like. Each digit is labelled with the rule that makes it count or not.
What you can do
- Counts significant figures and shows why, digit by digit
- Rounds to any number of significant figures
- Keeps trailing zeros: 1.20 and 1.2 are different
- Accepts very long numbers and standard form
- Shows the number rounded to each figure in turn